Lamina

(lam’-in-ah) [L., a plate or scale]. A thin plate or layer. L. cinerea, the connecting layer of gray matter between the corpus callosum and the optic chiasma. L., Cribriform, the cribriform plate of the ethmoid. L. cribrosa (of the choroid), that portion of the choroid which is perforated for the pa age of the optic nerve. L. cribrosa. I. The cribriform fascia covering the saphenous opening. 2. The anterior or posterior perforated space of the brain. 3. The perforated plates of bone through which branches of the cochlear or auditory nerve pa . L. fusc a, the pigmentary ti ue of the inner layer of the sclera forming the outer layer of the per i choroidal sinus. L. propria (of the tympanic membrane), the middle or fibrous layer of the tympanic membrane. L., Reticular, the hyaline membrane of the inner ear, extending between the conjoined head of Corti’s rods and the supporting cells. L. spiral is, a thin plate in the ear, o eous in the inner part and membranous in the outer, which divides the spiral tube of the cochlea into the scala tympani and the scala vestibuli. L. sup rach oroide a, the delicate connective-ti ue membrane uniting the choroid and sclerotic coats of the eye. L., Vitreous, a homogeneous membrane covering the inner surface of the choroid; it is also called the membrane of Bruch. 353